package com.sylar.happyreader.view;

import com.sylar.happyreader.tools.Config;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.SweepGradient;
import android.view.MotionEvent;
import android.view.View;

public class UniversalColorView extends View {
	private Paint mPaint;
	private Paint mCenterPaint;
	private Paint mHSVPaint;
	private final int[] mColors;
	private int[] mHSVColors;
	private boolean mRedrawHSV;
	private OnColorChangedListener mListener;
	private boolean mTrackingCenter;
	private boolean mHighlightCenter;
	private static  int CENTER_X = 100;
	private static  int CENTER_Y = CENTER_X;
	private static  int CENTER_RADIUS = 30;
	private static  int OUTER_RADIUS = 100;
	private static  int HSV_X = CENTER_X;
	private static  int HSV_Y_TOP = CENTER_Y + 10;
	private static  int HSV_Y_BOTOM = HSV_Y_TOP + 20;
	private static final float PI = 3.1415926f;

	public UniversalColorView(Context context, OnColorChangedListener listener, int color) {
		super(context);
//		this.setBackgroundColor(Color.LTGRAY);
		
		
		mListener = listener;
		mColors = new int[] { 0xFFFF0000, 0xFFFF00FF, 0xFF0000FF, 0xFF00FFFF, 0xFF00FF00, 0xFFFFFF00, 0xFFFF0000 };
		Shader s = new SweepGradient(0, 0, mColors, null);
		mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
		mPaint.setShader(s);
		mPaint.setStyle(Paint.Style.STROKE);
		mPaint.setStrokeWidth(55);
		mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
		mCenterPaint.setColor(color);
		mCenterPaint.setStrokeWidth(5);
		mHSVColors = new int[] { 0xFF000000, color, 0xFFFFFFFF };
		mHSVPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
		mHSVPaint.setStrokeWidth(10);
		mRedrawHSV = true;
		if(Config.screenWidth < 480){
			CENTER_X = 50;
			CENTER_Y = CENTER_X;
			CENTER_RADIUS = 10;
			OUTER_RADIUS = 50;
			HSV_X = CENTER_X;
			HSV_Y_TOP = CENTER_Y + 10;
			HSV_Y_BOTOM = HSV_Y_TOP + 20;
			mPaint.setStrokeWidth(30);
		}
	}

	@Override
	protected void onDraw(Canvas canvas) {
		float r = CENTER_X - mPaint.getStrokeWidth() * 0.5f;
		canvas.translate(CENTER_X, CENTER_X);
		int c = mCenterPaint.getColor();
		if (mRedrawHSV) {
			mHSVColors[1] = c;
			mHSVPaint.setShader(new LinearGradient(0 - HSV_X, 0, HSV_X, 0, mHSVColors, null, Shader.TileMode.CLAMP));
		}
		canvas.drawOval(new RectF(-r, -r, r, r), mPaint);
		canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint);
		canvas.drawRect(new RectF(0 - HSV_X, HSV_Y_TOP, HSV_X, HSV_Y_BOTOM), mHSVPaint);
		if (mTrackingCenter) {
			mCenterPaint.setStyle(Paint.Style.STROKE);
			if (mHighlightCenter) {
				mCenterPaint.setAlpha(0xFF);
			} else {
				mCenterPaint.setAlpha(0x80);
			}
			canvas.drawCircle(0, 0, CENTER_RADIUS + mCenterPaint.getStrokeWidth(), mCenterPaint);
			mCenterPaint.setStyle(Paint.Style.FILL);
			mCenterPaint.setColor(c);
		}
		if (mListener != null) {
			mListener.colorChanged(this, ColorChooserType.UNIVERSAL_COLOR_TYPE, mCenterPaint.getColor());
		}
		mRedrawHSV = true;
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		setMeasuredDimension(CENTER_X * 2, HSV_Y_BOTOM * 2 - 20);
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		float x = event.getX() - CENTER_X;
		float y = event.getY() - CENTER_Y;
		double radius = Math.sqrt(x * x + y * y);
		boolean inCenter = radius <= CENTER_RADIUS;
		boolean inOuter = radius <= OUTER_RADIUS;
		switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			mTrackingCenter = inCenter;
			if (inCenter) {
				mHighlightCenter = true;
				invalidate();
				break;
			}
		case MotionEvent.ACTION_MOVE:
			if (mTrackingCenter) {
				if (mHighlightCenter != inCenter) {
					mHighlightCenter = inCenter;
					invalidate();
				}
			} else if ((x >= 0 - HSV_X && x <= HSV_X) && (y <= HSV_Y_BOTOM && y >= HSV_Y_TOP)) {
				// see if we are in the hsv slider
				int a, r, g, b, c0, c1;
				float p;
				// set the center paint to this color
				if (x < 0) {
					c0 = mHSVColors[0];
					c1 = mHSVColors[1];
					p = (x + 100) / 100;
				} else {
					c0 = mHSVColors[1];
					c1 = mHSVColors[2];
					p = x / 100;
				}
				a = ave(Color.alpha(c0), Color.alpha(c1), p);
				r = ave(Color.red(c0), Color.red(c1), p);
				g = ave(Color.green(c0), Color.green(c1), p);
				b = ave(Color.blue(c0), Color.blue(c1), p);
				mCenterPaint.setColor(Color.argb(a, r, g, b));
				mRedrawHSV = false;
				invalidate();
			} else if (inOuter) {
				float angle = (float) Math.atan2(y, x);
				// need to turn angle [-PI ... PI] into unit [0....1]
				float unit = angle / (2 * PI);
				if (unit < 0) {
					unit += 1;
				}
				mCenterPaint.setColor(interpColor(mColors, unit));
				invalidate();
			}
			break;
		case MotionEvent.ACTION_UP:
			if (mTrackingCenter) {
				if (inCenter && mListener != null) {
					mListener.colorChanged(this, ColorChooserType.UNIVERSAL_COLOR_TYPE, mCenterPaint.getColor());
				}
				mTrackingCenter = false;
				invalidate();
			}
			break;
		}
		return true;
	}

	private int interpColor(int colors[], float unit) {
		if (unit <= 0) {
			return colors[0];
		}
		if (unit >= 1) {
			return colors[colors.length - 1];
		}
		float p = unit * (colors.length - 1);
		int i = (int) p;
		p -= i;
		// now p is just the fractional part [0...1) and i is the index
		int c0 = colors[i];
		int c1 = colors[i + 1];
		int a = ave(Color.alpha(c0), Color.alpha(c1), p);
		int r = ave(Color.red(c0), Color.red(c1), p);
		int g = ave(Color.green(c0), Color.green(c1), p);
		int b = ave(Color.blue(c0), Color.blue(c1), p);
		return Color.argb(a, r, g, b);
	}

	private int ave(int s, int d, float p) {
		return s + Math.round(p * (d - s));
	}

	public int getColor() {
		return mCenterPaint.getColor();
	}

	public void setColor(int color) {
		mCenterPaint.setColor(color);
	}
}
